Published: 2003
Total Pages: 14
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The authors present model-independent measurements of the branching fractions?(B° → D*{sub s} D*−) and?(D{sub s}+ →??+) based on 19.3 fb−1 of data collected by the BABAR detector at the PEP-II e+e− B Factory. Neutral B-meson decays to the D*{sub s}+D*− final state are selected with a partial reconstruction of the D*{sub s}+; that is, only the D*− and the soft photon from the decay D*{sub s}+ → D{sub s}+? are reconstructed. The branching fraction?(B° → D*{sub s}+ D*−) is extracted from these event yields, while?(D{sub s}+ →??+) is determined by combining this result with a previous measurement of the product?(B° → D*{sub s}+ D*−) x?(D{sub s}+ →??+) with partial reconstruction of the D*−. They obtain the following preliminary results:?(B° → D*{sub s}+ D*−) = (1.50 ± 0.16 ± 0.12)%,?(D{sub s}+ →??+) = (4.7 ± 0.6 ± 0.8)% where the first error is statistical, and the second systematic.